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学生信息管理系统

发表于 更新于 分类于 ， Valine：
本文字数： 11k 阅读时长 ≈ 10 分钟

C++课程作业

非文件操作:

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#include <iostream>
#include <cstring>
#include <iomanip>
#include <algorithm>
typedef long long ll;
using namespace std;
int K=0;
class STU
{
private:
    ll Num;
    char Name[10];
    char Sex;
    double Score;
    bool flag;
public:
    void TITLE_STU();
    void ADD_STU();
    void CHANGE_STU();
    void DEL_STU();
    void SHOW_STU();
    void SORT_STU();
    void MAX_STU();
    friend bool CMP(STU,STU);
    STU()
    {
        flag=0;
    }
    ~STU(){}
}Boy[1000];
bool CMP(STU a,STU b)
{
    if (a.Score == b.Score)
		return a.Num<b.Num;
	return a.Score>b.Score;
}
void STU::TITLE_STU()
{
    cout<<"\t1:\tADD A STUDENT"<<endl;
    cout<<"\t2:\tCHANGE STUDENTS\'S INFORMATION"<<endl;
    cout<<"\t3:\tDELETE A STUDENT"<<endl;
    cout<<"\t4:\tSHOW STUDENTS INFORMATION"<<endl;
    cout<<"\t5:\tSORT BY SCORE"<<endl;
    cout<<"\t6:\tSHOW THE MAX SCORE\' STUDENT"<<endl;
    cout<<"\t0:\tEXIT THE STUDENTS INFORMATION MANAGE SYSTEM"<<endl;
    cout<<endl<<"\tPLEASE ENTER SELECTED CHOICES FROM ABOVE LISTS"<<endl;
}
void STU::ADD_STU()
{
    cout<<"请输入要添加的学生人数"<<endl;
    int T;cin>>T;
    cout<<"请输入"<<T<<"行学生的学号,姓名,性别,成绩"<<endl;
    for(int i=0;i<T;i++,K++)
    {
        cin>>Boy[K].Num>>Boy[K].Name>>Boy[K].Sex>>Boy[K].Score;
        Boy[K].flag=0;
    }
    cout<<endl<<"学生信息导入成功"<<endl;
}
void STU::CHANGE_STU()
{
    cout<<"请输入要修改的学生学号,输入0停止删除"<<endl;
    ll num;
    while(cin>>num)
    {
        int flag=0;
        for(int i=0;i<K;i++)
        {
            if(num==Boy[i].Num)
            {
                cout<<"请再次输入学生的学号,姓名,性别,成绩"<<endl;
                cin>>Boy[i].Num>>Boy[i].Name>>Boy[i].Sex>>Boy[i].Score;
                Boy[i].flag=0;
                flag=1;
                cout<<"学生信息修改成功"<<endl;
            }
        }
        if(num==0)break;
        if(flag==0)cout<<"NO SUCH STUDENTS"<<endl;
    }
}
void STU::DEL_STU()
{
    cout<<"请输入要删除的学生学号,输入0停止删除"<<endl;
    ll num;
    while(cin>>num)
    {
        int flag=0;
        for(int i=0;i<K;i++)
        {
            if(num==Boy[i].Num)
            {
                Boy[i].flag=1;
                flag=1;
                cout<<"DELETE SUCCESS!"<<endl;
                break;
            }
        }
        if(num==0)break;
        if(flag==0)cout<<"NO SUCH STUDENTS"<<endl;
    }
}
void STU::SHOW_STU()
{
    cout<<endl<<"\tThe Lists Of Students Are Here"<<endl;
    cout<<"-----------------------------------------------"<<endl;
    cout<<"    学号\t姓名\t\t性别\t成绩"<<endl;
    cout<<"-----------------------------------------------"<<endl;
    cout.setf(std::ios::left);
    for(int i=0;i<K;i++)
    {
        if(Boy[i].flag==0)
        {
            cout<<Boy[i].Num<<'\t';
            cout<<setw(8)<<Boy[i].Name;
            cout<<"\t "<<Boy[i].Sex<<'\t';
            cout<<setiosflags(ios::fixed)<<setprecision(2)<<Boy[i].Score<<endl;
        }
    }
    cout<<"-----------------------------------------------"<<endl;
}
void STU::SORT_STU()
{
    sort(Boy,Boy+K,CMP);
    cout<<"学生信息排序成功"<<endl;
}
void STU::MAX_STU()
{
    int Maxn=0,Flag=0;
    for(int i=0;i<K;i++)
    {
        if(Boy[i].Score>=Boy[Maxn].Score)
        {
            Maxn=i;
            Flag=1;
        }
    }
    if(Flag==0)cout<<"NO STUDENT"<<endl;
    else
    {
        cout<<"-----------------------------------------------"<<endl;
        cout<<"    学号\t姓名\t\t性别\t成绩"<<endl;
        cout<<"-----------------------------------------------"<<endl;
        cout.setf(std::ios::left);
        cout<<Boy[Maxn].Num<<'\t';
        cout<<setw(8)<<Boy[Maxn].Name;
        cout<<"\t "<<Boy[Maxn].Sex<<'\t';
        cout<<setiosflags(ios::fixed)<<setprecision(2)<<Boy[Maxn].Score<<endl;
        cout<<"-----------------------------------------------"<<endl;
    }
}
int main()
{
    STU S;
    S.TITLE_STU();
    int choice;
    while(cin>>choice)
    {
        if(choice==1)S.ADD_STU();
        else if(choice==2)S.CHANGE_STU();
        else if(choice==3)S.DEL_STU();
        else if(choice==4)S.SHOW_STU();
        else if(choice==5)S.SORT_STU();
        else if(choice==6)S.MAX_STU();
        else if(choice==0)break;
        system("PAUSE&CLS");
        S.TITLE_STU();
    }
    return 0;
}

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#include <iostream>
#include <cstdio>
#include <cstring>
#include <iomanip>
#include <algorithm>
typedef long long ll;
using namespace std;
int K = 0;
class STU
{
private:
	ll Num;
	char Name[10];
	char Sex;
	double Score;
	bool flag;
public:
	void READ_STU();
	void WRITE_STU();
	void TITLE_STU();
	void ADD_STU();
	void CHANGE_STU();
	void DEL_STU();
	void SHOW_STU();
	void SORT_STU();
	void MAX_STU();
	friend bool CMP1(STU, STU);
	friend bool CMP2(STU, STU);
	friend bool CMP3(STU, STU);
	STU()
	{
		flag = 0;
	}
	~STU() {}
}Boy[1000];
void STU::READ_STU()
{
	FILE *fp = fopen("STU.dat", "r");
	while (fscanf(fp, "%lld %s %c %lf", &Boy[K].Num, &Boy[K].Name, &Boy[K].Sex, &Boy[K].Score) != EOF)
	{
		Boy[K].flag = 0;
		K++;
	}
	fclose(fp);
}
void STU::WRITE_STU()
{
	FILE *fp = fopen("STU.dat", "w");
	for (int i = 0; i < K; i++)
	{
		if(Boy[i].flag==0)
		fprintf(fp, "%lld %s %c %lf\n", Boy[i].Num, Boy[i].Name, Boy[i].Sex, Boy[i].Score);
	}
	fclose(fp);
}
bool CMP1(STU a, STU b)
{
	return a.Num<b.Num;
}
bool CMP2(STU a, STU b)
{
	if (strcmp(a.Name,b.Name)==0)
		return a.Num<b.Num;
	return strcmp(a.Name,b.Name)<0;
}
bool CMP3(STU a, STU b)
{
	if (a.Score == b.Score)
		return a.Num<b.Num;
	return a.Score>b.Score;
}
void STU::TITLE_STU()
{
	cout << "\t1:\tADD A STUDENT" << endl;
	cout << "\t2:\tCHANGE STUDENTS\'S INFORMATION" << endl;
	cout << "\t3:\tDELETE A STUDENT" << endl;
	cout << "\t4:\tSHOW STUDENTS INFORMATION" << endl;
	cout << "\t5:\tSORT THE STUDENTS" << endl;
	cout << "\t6:\tSHOW THE MAX SCORE\' STUDENT" << endl;
	cout << "\t0:\tEXIT THE STUDENTS INFORMATION MANAGE SYSTEM" << endl;
	cout << endl << "\tPLEASE ENTER SELECTED CHOICES FROM ABOVE LISTS" << endl;
}
void STU::ADD_STU()
{
	cout << "请输入要添加的学生人数" << endl;
	int T; cin >> T;
	cout << "请输入" << T << "行学生的学号,姓名,性别,成绩" << endl;
	for (int i = 0; i<T; i++, K++)
	{
		cin >> Boy[K].Num >> Boy[K].Name >> Boy[K].Sex >> Boy[K].Score;
		Boy[K].flag = 0;
	}
	cout << endl << "学生信息导入成功" << endl;
}
void STU::CHANGE_STU()
{
	cout << "请输入要修改的学生学号,输入0停止删除" << endl;
	ll num;
	while (cin >> num)
	{
		int flag = 0;
		for (int i = 0; i<K; i++)
		{
			if (num == Boy[i].Num)
			{
				cout << "请再次输入学生的学号,姓名,性别,成绩" << endl;
				cin >> Boy[i].Num >> Boy[i].Name >> Boy[i].Sex >> Boy[i].Score;
				Boy[i].flag = 0;
				flag = 1;
				cout << "学生信息修改成功" << endl;
			}
		}
		if (num == 0)break;
		if (flag == 0)cout << "NO SUCH STUDENTS" << endl;
	}
}
void STU::DEL_STU()
{
	cout << "请输入要删除的学生学号,输入0停止删除" << endl;
	ll num;
	while (cin >> num)
	{
		int flag = 0;
		for (int i = 0; i<K; i++)
		{
			if (num == Boy[i].Num)
			{
				Boy[i].flag = 1;
				flag = 1;
				cout << "DELETE SUCCESS!" << endl;
				break;
			}
		}
		if (num == 0)break;
		if (flag == 0)cout << "NO SUCH STUDENTS" << endl;
	}
}
void STU::SHOW_STU()
{
	cout << endl << "\tThe Lists Of Students Are Here" << endl;
	cout << "-----------------------------------------------" << endl;
	cout << "    学号\t姓名\t\t性别\t成绩" << endl;
	cout << "-----------------------------------------------" << endl;
	cout.setf(std::ios::left);
	for (int i = 0; i<K; i++)
	{
		if (Boy[i].flag == 0)
		{
			cout << Boy[i].Num << '\t';
			cout << setw(8) << Boy[i].Name;
			cout << "\t " << Boy[i].Sex << '\t';
			cout << setiosflags(ios::fixed) << setprecision(2) << Boy[i].Score << endl;
		}
	}
	cout << "-----------------------------------------------" << endl;
}
void STU::SORT_STU()
{
	int x=0;
	cout << "1.按学号排序" << endl;
	cout << "2.按姓名排序" << endl;
	cout << "3.按成绩排序" << endl << endl;;
	cout << "请选择排序规则!" << endl;
	cin >> x;
	if(x==1)sort(Boy, Boy + K, CMP1);
	else if(x==2)sort(Boy, Boy + K, CMP2);
	else if (x == 3)sort(Boy, Boy + K, CMP3);
	else cout << "输入错误，排序失败" << endl << endl;;
	if (x == 1 || x == 2 || x == 3)cout << "学生信息排序成功" << endl << endl;
}
void STU::MAX_STU()
{
	int Maxn = 0, Flag = 0;
	for (int i = 0; i<K; i++)
	{
		if (Boy[i].Score >= Boy[Maxn].Score)
		{
			Maxn = i;
			Flag = 1;
		}
	}
	if (Flag == 0)cout << "NO STUDENT" << endl;
	else
	{
		cout << "-----------------------------------------------" << endl;
		cout << "    学号\t姓名\t\t性别\t成绩" << endl;
		cout << "-----------------------------------------------" << endl;
		cout.setf(std::ios::left);
		cout << Boy[Maxn].Num << '\t';
		cout << setw(8) << Boy[Maxn].Name;
		cout << "\t " << Boy[Maxn].Sex << '\t';
		cout << setiosflags(ios::fixed) << setprecision(2) << Boy[Maxn].Score << endl;
		cout << "-----------------------------------------------" << endl;
	}
}
int main()
{
	STU S;
	S.TITLE_STU();
	S.READ_STU();
	int choice;
	while (cin >> choice)
	{
		if (choice == 1)S.ADD_STU();
		else if (choice == 2)S.CHANGE_STU();
		else if (choice == 3)S.DEL_STU();
		else if (choice == 4)S.SHOW_STU();
		else if (choice == 5)S.SORT_STU();
		else if (choice == 6)S.MAX_STU();
		else if (choice == 0)
		{
			S.WRITE_STU();
			break;
		}
		system("PAUSE&CLS");
		S.TITLE_STU();
	}
	return 0;
}

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